Void pointer arithmetic

[Sven Eschenberg <eschenb@xxxxxxxxxxxxxxxxxxx>]

Hi list,

Long time ago I wrote a small application, well back when g++ didn't 
even insist on std::cout. Now, since I upgrade g++ and tried to compile 
the application, g++ threw errors and warnings in masses. Most of the 
stuff I could fix, but I am stuck with the following problem:

/usr/include/linux/netfilter_ipv4/ip_tables.h: In function 
'xt_entry_target* ipt_get_target(ipt_entry*)':
/usr/include/linux/netfilter_ipv4/ip_tables.h:225: error: pointer of 
type 'void *' used in arithmetic
/usr/include/linux/netfilter_ipv4/ip_tables.h:225: error: invalid 
conversion from 'void*' to 'xt_entry_target*'

Is there any chance of fixing the problem without tweaking the kernel 
includes (the running kernel is kinda ancient, but updates are a little 
difficult)?

Thnx

-Sven